Too long text server error

collection/migrations/0008_auto_20190828_0450.py

@@ -0,0 +1,17 @@
+# Generated by Django 2.0.1 on 2019-08-28 04:50
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('collection', '0007_auto_20181008_2042'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='collection',
+            unique_together=set(),
+        ),
+    ]

collection/migrations/0009_auto_20190828_0457.py

@@ -0,0 +1,15 @@
+# Generated by Django 2.0.1 on 2019-08-28 04:57
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('collection', '0008_auto_20190828_0450'),
+    ]
+
+    operations = [
+        migrations.RunSQL(
+            "CREATE UNIQUE INDEX collection_collection_title_text_type_id_uniq ON collection_collection (title, md5(text), type_id)"),
+    ]

collection/models.py

@@ -82,5 +82,3 @@ def repl(match):
         text = Sentence(text=self.text).html  # convert words to links
         return re.sub(r"{{sentence:([0-9]+)}}", repl, text, flags=re.MULTILINE)
 
-    class Meta:
-        unique_together = ('title', 'text', 'type',)

collection/views.py

@@ -60,7 +60,10 @@ def keyword_filtered(request):
         # eg. poem
         collection_type = first_collection_obj.type
         # eg. all poems
-        collections = Collection.objects.filter(type=collection_type)
+        collections = []
+        for collection_type in Collection.objects.all().distinct("type"):
+            collection_sample = Collection.objects.filter(type=collection_type.type).order_by("-id")[0:3]
+            collections.extend(list(collection_sample))
         context["collections"] = collections
         context["active_collection"] = collection_type
         # to delete <br> from html text